|Model|Frame|Years Mfg'd|Caliber(s)|Production|Barrel|Notes|
|---|---|---|---|---|---|---|
|Remington-Beals Army Model Revolver|Large|1861-1862|.44|1,900 (estimated)|8 inch octagon||
|Remington-Beals Navy Model Revolver|Medium|1861-1862|.36|14,500 (estimated)|7 1/2 inch octagon||
|1861 Army Revolver (Old Model Army)|Large|1862|.44|6,000 (estimated)|8 inch octagon||
|1861 Navy Revolver|Medium|1862|.36|7,000 (estimated)|7 3/8 inch octagon||
|New Model Army Revolver|Large|1863-1875|.44|122,000 (approximately)|8 inch octagon|Used for factory conversions in .46 RF & .44 Remington|
|New Model Navy Revolver|Medium|1863-1875|.36|28,000 (approximately)|7 3/8 inch octagon|Used for factory and U.S. Navy conversions to .38 RF & CF|
|New Model Single Action Belt Revolver|Large|1863-1875|.36 percussion and .38 CF|2,500 - 3,000 (estimated)|6 1/2 inch octagon|Factory conversion production started in 1873|
|Remington-Rider Double Action New Model Belt Revolver|Large|1863-1873|.36 percussion and .38 CF|3,000 - 5,000 (estimated)|6 1/2 inch octagon|1863-1865 available with fluted cylinder, conversions had two-piece cylinder|
|New Model Police Revolver|Medium|1865-1873|.36 percussion and .38 RF|25,000 (estimated)|3 1/2, 4 1/2, 5 1/2, 6 1/2 inch octagon|Conversions all believed to be rimfire only|
|New Model Pocket Revolver|Medium|1865-1873|.31 percussion and .32 CF|25,000 (estimated)|3, 3 1/2, 4, 4 1/2|Majority produced as conversions or cartridge|

Question: what was the last year of manufacture for these revolvers?
Answer: 1875